What affect does exercise have on the nervous system

The nervous system consist of the brain, spinal cord and nerve fibers. Exercise Improves the brain  

Exercise stresses the muscles which creates growth factors. This contributes to new brain cells and it increases the number of pathways for oxygen,energy and to remove waste from the brain. 
hope this helps!

Well when i was in the hospital about a month i read books, played on my phone, and i drew. another fun thing you can do is prank the staff.

Your dog can sniff at or even eat a bit of catnip. the herb is edible and not harmful. just don't expect them to roll around like a cat would! your dog may scrutinize catnip by licking and smelling at it, or be totally indifferent to this stimulant.